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murso74
Samba Member
Joined: October 05, 2018
Posts: 37
Location: CO
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 Posted: Sat Jan 15, 2022 1:51 pm Post subject: Eurovan idle on startup |
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| So my eurovan had started idling around 800 rpm on startup, randomly, in cold and not so cold weather. There's sometimes a bit of a rough idle, but it doesn't last long. When it warms up it hunts a bit around 600-650. It used to idle at around 1200 for about 5 minutes before dropping down to normal idle. It's not every time now, but at least half the time. It's this normal behavior? It only seemed to start doing it when it got chilly out. |
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Abscate
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Joined: October 05, 2014
Posts: 22665
Location: NYC/Upstate/ROW
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| Posted: Sat Jan 15, 2022 8:54 pm Post subject: Re: Eurovan idle on startup |
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Instead of using an air pump to burn the cold start fuel , VW changes the valve timing to make a fast idle. That action is temperature dependent
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dazey77
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Joined: May 11, 2020
Posts: 163
Location: Other side of the pond.
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| Posted: Mon Jan 17, 2022 12:48 pm Post subject: Re: Eurovan idle on startup |
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| Abscate wrote: |
| Instead of using an air pump to burn the cold start fuel , VW changes the valve timing to make a fast idle. That action is temperature dependent |
Not sure what you meant to say here but there is no variable valve timing (at least on the 5 cyl). You perhaps meant ignition timing? The fuel mix would also be richer at startup.. The 95 does include an air pump you mention but it’s for startup emissions and doesn’t effect fuelling as far as I know.
I would suspect temp sensor, may even just have corroded contactS. If you can find someone with a diagnostic tool you can check values to see if they correspond to reality.
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Abscate
Samba Member
Joined: October 05, 2014
Posts: 22665
Location: NYC/Upstate/ROW
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| Posted: Mon Jan 17, 2022 12:57 pm Post subject: Re: Eurovan idle on startup |
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Yeah, need to know year and engine type to help.
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